Lumen Celeritas (ケレリタス・ルーメン,Kereritasu Rūmen) is a lazy youkai who claims that they were a hero long ago. If they absorb moonlight, they become very destructive. They are the stage 3 boss and Extra stage midboss of Earthen Miraculous Sword, the second game of the Len'en Project.

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Because Lumen is a sunlight-youkai, they're usually only active during the day. They're famed as one of the "Three Lights", and resolved a certain incident long ago. However, if they end up absorbing moonlight, they become very violent and destructive, but they don't realize it, not even the fact that they have destroyed entire villages with their power.

Lumen has a hopelessly calm disposition. During the daytime, they doze in the sunlight, and at night they sleep beneath a tree. They talk and act very childishly, but it's because they're always sleeping defenselessly in the middle of the road. When they absorb moonlight, they go berserk and start saying random words and throwing rays of light everywhere.

Lumen can absorb sunlight with the shell on their back. They can also absorb moonlight which makes them stronger, to the point they can break the mountains, pierce the earth and even tear a hole into the Mugenri Barrier. However, every time they absorb moonlight, they go berserk and have no control over their own actions.

Their full name is Lumen Celeritas (ケレリタス・ルーメン), which implies a Western origin. The name has been confirmed to actually be in Japanese naming order,[1] so "Lumen Celeritas" is the Western name order. The middle dot (・) in the middle of their name is just something used in foreign names to show where the next word begins, and this doesn't affect the naming order.

Their given name "Lumen" is Latin for "light". Their surname "Celeritas" is the Latin word for "speed" or "swiftness", which is often explained to be the origin of the notation c, the universal notation for the speed of light in a vacuum, as popularized in Albert Einstein's famous equation "E = mc²". JynX has stated that the name itself is an "inherently weird name".[1]

Lumen has short, grey hair and their eyes are the same color. Their hair is decorated with ofuda on each side of their head. They have a red shell on their back, which they use to absorb the light. In their crazy mode (EX-Lumen), their shell and the talismans on their head are broken. They wear a sleeveless white haori and a short black skirt.

In Brilliant Pagoda or Haze Castle, Lumen's clothes are covered in more ofuda and they wear a shimenawa and kadomatsu on their head, presumably in order to prevent them from absorbing moonlight again. One of their ofuda has the words "Idiot Hero" (馬鹿偉人) on it, which was used to describe them in their Extra stage profile. Their shell seems to have been removed.

As a sunlight-youkai, the cloudy incident is problematic for Lumen, so they go searching for the culprit, but run into the heroes instead, believing them to be the culprits. Frustrated and hungry after being defeated, they go to sleep, but by now the heroes have defeated the real culprit and the sky is clear once again. A sleeping Lumen ends up absorbing moonlight, and their violent and destructive persona emerges, attacking the protagonists again for little reason.

After escaping from the Unlost Woods, Yabusame realizes they are lost. They encounter Lumen, who gets offended after being called an idiot by the human. They engage in a nonsensical conversation about food, which concludes with Lumen accusing Yabusame of being the culprit behind the clouds incident after watching them eat a bag of raw salt. Lumen is defeated and asks who the real culprit is, while Yabusame realizes that defeating Jun Amanomiya before didn’t solve anything, and goes to find the real culprit. After Yabusame defeats the real mastermind, Lumen absorbs moonlight and goes berserk. Yabusame notices that Lumen looks different from their last fight, but they defeat them again.

Lumen accuses Kuroji of being the culprit, because they are a suspicious flying black human, despite Kuroji saying that Tsubakura is black as well. Upon Lumen's defeat, Kuroji advises them not to make conclusions based on other people’s appearances. After the heroes defeat the real mastermind, Lumen absorbs moonlight and becomes berserk. They go to take revenge on Kuroji for defeating them before, but they lose again. According to Kuroji, the fight was so fast that even they didn't notice it.

While Yabusame and company are doubting about "The Heaven divides the mirror" Lumen appears, complaining about how uncomfortable the ofuda are. Tsubakura asks them if they were the one who created the rumor in order to lure them out. Lumen doesn’t deny it, so they fight. After they are defeated, Shion says that Lumen is not related to the incident in any way. When confronting Lumen about it, they say that they didn’t defend themself because they would have attacked them anyway.

Fumikado and their lackeys encounter Lumen. They recognize them as a famed hero who resolved an incident long ago. However, upon seeing Lumen’s appearance, they start doubting if they are actually a hero. Offended, Lumen fights them and is defeated. Fumikado praises them anyway.

↑Taiji is a Chines philosophical concept referring to the ultimate principle of the universe.

↑Sumeru is the name of the mountain at the center of the world in Buddhist cosmology. Mt. Sumeru is surrounded by several concentric rings of alternating mountains and oceans which form the world. The entire land where humans live is just an island in one of the outer oceans. The Universe of One Billion Worlds is a space containing one billion of these worlds, each with it's own Mt. Sumeru at it's center. How could such a large place possibly be constricting?